https://bugs.winehq.org/show_bug.cgi?id=29249
--- Comment #18 from Bruno Jesus 00cpxxx@gmail.com --- (In reply to Jacek Caban from comment #17)
I'm pretty sure wininet doesn't compose HTML listing itself. I'd suggest to test it with Wireshark or similar tool and see what's the difference between native and builtin wininet. That should give a precise hint what's wrong.
The difference is that after login wine sends RETR / resulting in invalid file and native sends CWD /, TYPE A, PASV, LIST and then somehow we end up with a file listing in iexplore screen.